三分域模型在研究单胃动物内源氨基酸排泄中的应用

本文在分析三分域链状系统模型及单胃动物内源氨基酸排泄特点的基础上 ,讨论了如何将三分域链状模型用于单胃动物内源氨基酸排泄模式的确定。研究分三步进行 :1.测定动物血液体积 ;2.静脉连续灌注同位素标记的氨基酸并使之于体内达到平衡 ;3.检测消化道中同位素标记氨基酸的排泄率。文章指出 ,若能对所有必需氨基酸的内源排泄率均进行测定 ,则可得出内源氨基酸排泄模式 ,因而在实际测定饲料或日粮真可消化氨基酸含量时 ,只需测定某种氨基酸的内源排泄量即可知其它氨基酸的内源排泄状况     

辽宁西部半干旱地区油松纯林改造的研究

喀左县位于辽宁西部地区，现存大面积油松人工纯林，不仅改善地力和水土保持效益差，而且火险性强、虫害蔓延成灾、生长早期衰退。为改善其林分生态条件，提高林木生长量和综合效益，在中三家镇对25年生油松人工纯林进行改造试验。结果表明，选择山杏、刺槐、沙棘等乔、灌木树种，利用林间空地、林缘隙地、侵蚀沟壑和疏林地造林，在大面积油松纯林连片地区进行窄带状或块状砍伐后造林，5年后效益显著，林分相对湿度提高了2．2％，土壤有机质含量提高5．4％，土壤含水量提高9．8％，减轻土壤容重３％,林分虫害明显下降，油松树高、胸径生长量分别提高22．6％、19．8％。     

山地橄榄主要病虫害种类及其防治措施

介绍了山地橄榄2种病害：叶斑病、炭疽病；5种虫害：橄榄星室木虱、黑刺粉虱、恶性叶甲、橄榄枯叶蛾、橄榄野螟的主要特征和危害症状，并提出了防治措施。     

Markers, old and new, for examining Phytophthora infestans diversity

Late blight, caused by Phytophthora infestans , is an ongoing threat to potato and tomato crop production worldwide and considerable fundamental and applied research is conducted with the long-term aim of improved disease control. Understanding the mechanisms, processes and rates of P. infestans evolution is an important factor in predicting the effectiveness and durability of new management practices. A range of phenotypic and genotypic tests has been applied to achieve this goal, but each has limitations and new methods are sought. Recent progress in P. infestans genomics is providing the raw data for such methods and new high-throughput codominant biomolecular markers are currently being developed that have tremendous potential in the study of P. infestans population biology, epidemiology, ecology, genetics and evolution. This paper reviews some key applications, recommends some changes in approach and reports on the status and potential of new and existing methods for probing P. infestans genetic diversity.     

二阶拟线性椭圓型Euler方程组解的Pohozaev型恒等式及其应用

本文对于二阶椭圆型Euler方程组 -∑D_αF_(q_α~i)(x,u,Du)+F_(ui)(x,u,Du)=0得到了一些积分恒等式,利用这些恒等式证明了某些方程组非平凡解的不存在性。     

计提长期资产减值准备的不良影响及防范

由于历史和现实条件的限制，我国新的投资准则有关长期资产减值准备的计提与实施，会出现一些难以避免的不良影响。如容易偏离历史成本，计提依据不易掌握，新旧概念易于混淆，国家税易于流失，影响会计核算工作及时性和国有资产的保值与增值等等。就这些不良影响及其防范，提出了几种浅显的看法。     

Expression and modulation of connective tissue growth factor in renal interstitial fibrosis

CTGF, a member of the CCN family of immediate early genes, is a recently discovered profibrotic growth factor, which is involved in many pathophysiologic procedures. CTGF acts as a downstream effector of TGF-β acting on interstitial cells to enhance the progression of fibrotic renal diseases. It has been shown that CTGF gene expression can be induced or blocked by some kinds of cytokine and drugs. It is an interesting candidate target for future intervention strategies of renal interstitial fibrosis.     

香鱼人工育苗技术

根据作者多年来香鱼人工育苗的实践经验，总结了香鱼人工繁殖和苗种培育中关键性的技术。     

我国减灾农业发展的形势和对策

我国农业减灾面临严峻形势，每年发生的农业灾害都造成重大损失，通过发展减灾农业才能确保我国社会经济持续稳定地增长。我国农业减灾系统建设己初见成效，今后的主要任务是进一步完善农业减灾系统的结构和功能，提高农业减灾的技术水平，加强灾害教育工作，增加减灾资金投入。